Thomas k



LOCK.

Specification of Letters Patent No. 23,967, dated `May 10, 1859.

To all whom 'it may concern:

Be it known that I, THOMAS K. WEs'rER, of Lawrence, in the county ofEssex and Commonwealth of Massachusetts, have invented an Improved Lockfor Doors, Chests, Trunks, &c.; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, on which- Figure l represents the interior view of a lock withall its parts, when unlocked. Fig. 2 represents the same when locked.Fig. 3 represents underside of cover to lock. Fig. 4L representsinterior view of bolt. Fig. 5 represents lock case. Figs. 6, 7 and 8represent the different views of the guard used to protect the lock frompickers see E. Fig. 9 represents one of the levers with spring. Fig. 10represents side view of key.

The bolt see Fig. 4, is made hollow to receive the levers and springs assee B, Figs. l and 2, H being an elevated cylinder made to enter thetube of the key, and, K, an elevated circular arc around the key holeworks in the groove, K, of the key.

L, is a circular arc attached to the cover see Fig. 3, and passes in thegroove L of the key.

E, is a guard or :tender and is relied on to protect the levers, theends of the levers, c, being directly behind it, leaving no direct viewof the levers from the key hole either when locked or unlocked. Now whenthe key is put into the key hole the groove, K, of the key passes aroundthe elevated are of the lock, K, and the groove, L, of the key passesaround the circular arc, L, of the lock and the guard or fender E whenthe face of the key touches a series of levers with springs, C, oflength and thickness to correspond to the face of the key and are movedfrom the shoulder piece D, and the bolt is thus made to slide either inlocking or unlocking.

The advantage of my lock over others is that it will be hard to pick,there being no direct communication from the key hole to the levers theview being cut off by the guard or fender E.

' I claim- The guard or tender E as described in the specication and forthe purpose therein described.

THOS. K. WEBSTER. [n s] In presence of- E. D. HAYES, JAMES H. BAKKER.

